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-   -   The 3.7L upping gas milage thread. (http://www.jeepgarage.org/f5/the-3-7l-upping-gas-milage-thread-8709.html)

ALPINEST4RS 04-19-2010 05:45 PM

The 3.7L upping gas milage thread.
 
Ok guys, I think I am going to start expirmenting on my car how to get some better gas milage out of this thing.


So far I have..
-Aligned vehicle
-Installed new plugs

and thats it! haha.

So what else can I do? I'm willing to go out of the box to see what I can do to make this car more gas friendly. I average about 20-22mpg on the highway and 15-16 in the city.

I've been unlucky about finding pcm tunes for this car. I heard something about the IAT resistor mod. Is that doable on the 3.7L? I want to stay away from a CAI UNLESS I tune the pcm. Could I do a throttle body or even possible (old school) a water jet setup?

Chime in peeps I'm aiming for as much as I can get!

DJ BoNiOmArIo 04-19-2010 05:59 PM

Re: The 3.7L upping gas milage thread.
 
you have an 06 talk to nick at airram they are successfull on unlocking some of the files on the 05-06 3.7L for the SCT tuner

maxst2 04-19-2010 06:32 PM

Re: The 3.7L upping gas milage thread.
 
Intake, exhuast, custom tune(kinda pricy since there isnt superchips/diablo/sct tuner off the shelf for the 3.7L), throttle body port and polish, lower it, Shred pounds off it - will help alot, body kit for aero - make it less like a moving brick.

Your in a heavy SUV... not much you can do. lol

WSP Jeep 04-19-2010 07:19 PM

Re: The 3.7L upping gas milage thread.
 
You could also switch to synthetic oil, install a powerwire, and a weld on a muffler. I have definitely seen an increase in mpg's from each one of these mods.

mjl2610 04-19-2010 08:13 PM

Re: The 3.7L upping gas milage thread.
 
Quote:

Originally Posted by maxst2 (Post 192404)
Your in a heavy SUV... not much you can do. lol

That's really the bottom line. You are driving a 4000 pound suv, with a not so efficient Chrysler suv engine. Im assuming your Jeep is a 4x4 also. What you are averaging is what you are going to get at the most, there's not much more you are going to be able to get outta it.

mitchelm 04-19-2010 09:33 PM

Re: The 3.7L upping gas milage thread.
 
U can also inflate the tires to 35-40psi. You could also purchase lower resistance rolling tires. You'll sacrifice handling and stopping distance, but you'll gain in mpg. Sythetic oil will help too. Best bet, just inflate your tires a little more.

maxst2 04-19-2010 09:55 PM

Re: The 3.7L upping gas milage thread.
 
I was going to say get street tires... no all terrains..but like onroad only tires. If you are out to go SRT clone.. might as well lol

misfit77 04-19-2010 11:55 PM

Re: The 3.7L upping gas milage thread.
 
My service guy said that the OEM oil is synthetic...not sure if I beleive him

B.P.O.D 04-20-2010 03:15 PM

Re: The 3.7L upping gas milage thread.
 
^^^ that is BS, def not synthetic!

my mileage sucks! lots of stop and go traffic on my daily commute to work. i usually get 10-12 mpg in the city..

highway cruising at 80 i get about 18mpg. drop to 65mph and i get 21:(

Megatron 04-20-2010 03:19 PM

Re: The 3.7L upping gas milage thread.
 
Quote:

Originally Posted by B.P.O.D (Post 192933)
^^^ that is BS, def not synthetic!

my mileage sucks! lots of stop and go traffic on my daily commute to work. i usually get 10-12 mpg in the city..

highway cruising at 80 i get about 18mpg. drop to 65mph and i get 21:(

Damn thats wierd irf.. I have around 13.7 in the city and around 24 on the highway at like 65mph. whats even weirder is that my jeep should have worse numbers than you since i am heavier with the pushbars and such?..... :confused:

Matt 04-20-2010 03:20 PM

Re: The 3.7L upping gas milage thread.
 
Quote:

Originally Posted by Father Paul (Post 192936)
Damn thats wierd irf.. I have around 13.7 in the city and around 24 on the highway at like 65mph. whats even weirder is that my jeep should have worse numbers than you since i am heavier with the pushbars and such?..... :confused:

He weighs more.

(lol)

Megatron 04-20-2010 03:52 PM

Re: The 3.7L upping gas milage thread.
 
Quote:

Originally Posted by Matt (Post 192938)
He weighs more.

(lol)

True. Excuse my six pac abs....


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